There's a theory that often players struggle to shine again once they leave the tutelage of Mauricio Pochettino.

Some of the players from the Argentine's Southampton and Espanyol days have struggled to recapture the performances they managed under the manager after moving on to their new club.

Another batch of players left Tottenham Hotspur this summer and we've taken a look at how the departing flock are doing now, away from Pochettino's guidance.

Do they dispel the Pochettino nest theory, do they conform to it or did they simply prove they probably weren't good enough for Tottenham in the first place?

Kyle Walker has enjoyed success at Manchester City

Kyle Walker

There's only one place to start. The England right-back left Spurs to join Manchester City for a then world record fee for a defender in the summer of upward of £50m.

Pochettino was unhappy when the England international told him he wanted to leave in the midst of Spurs' title challenge, but how has he done at City so far?

One of the benefits for Walker has been that he was moving to learn from another manager who enjoys working with full-backs in Pep Guardiola and its hard to say it hasn't been a complete success for the defender.

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The 27-year-old has appeared in 42 matches across all competitions and delivered seven assists. It could be pointed out that Kieran Trippier has provided the same amount of assists from 22 appearances in the Premier League and Champions League but Walker could simply point to the medal already in his possession.

City won the Carabao Cup in February and have almost clinched the Premier League title. The low point for Kyle Walker this season has probably been his involvement in Will Grigg's goal for Wigan which knocked City out of the FA Cup.

However, Walker's move certainly has been little but a success for him.

Kevin Wimmer in action for Stoke City

Kevin Wimmer

While Walker has profited from his move, Kevin Wimmer's departure to Stoke City has been less successful.

The 25-year-old Austrian international left Spurs in an £18m summer move in search of more game time and he initially got it under Mark Hughes, making 19 appearances in all competitions in a struggling side.

However, Wimmer is yet to appear under new manager Paul Lambert and to add insult to injury he was placed on a special fitness regime by the Scot.

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"I just thought Kevin needed a little bit more fitness," said the Stoke boss this month. "The standard that I expect... I thought it should have been higher from him. But to be fair to Kevin he has worked hard to get there. He has done well."

Pochettino demands high fitness levels from his players so it seems something changed with Wimmer since that summer move.

Yes him. The Algeria international hasn't pulled on a Spurs shirt since 2016 but he only joined Schalke permanently last summer after the end of his loan period at the Bundesliga club.

The 23-year-old started off as a regular under Pochettino when the Argentine first arrived at Tottenham, playing alongside Ryan Mason in the engine room, before moving to the fringes of the team and then found himself out of the squad when he asked to leave.

It's been a strange season for Bentaleb so far in Germany. His attitude was sometimes questioned during his time at Spurs and he has fallen out with Schalke boss Domenico Tedesco at times this season, which along with injury has limited his playing time to just 14 matches. He played just once between November and late February.

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However, he has patched things up with the boss and has been playing regularly in recent weeks and Tedesco has been praising the young midfielder.

"Of the quality, Nabil would definitely be a Goretzka successor," he said this month. Schalke's sporting director Christian Heidel added: "We all agree with Schalke that maybe Nabil is the best footballer in the whole team. Nabil will gradually move closer, game by game, to the performance he can bring."

Another who hasn't appeared for Spurs in some time, but sealed a permanent move to Roma after a successful loan spell.

The big Argentine never convinced in north London, but Fazio appears to have found a home in Rome and has earned plenty of plaudits for his defensive displays.

The 31-year-old is a mainstay of the Roma defence and has appeared 25 times in Serie A so far this season, scoring twice. He's also played seven times in the Champions League and registered an assist in that competition.

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Like Walker, he came up against Spurs soon after his official departure, playing against the Lilywhites for Roma in the club's pre-season tour of the USA, when the two sides met in New Jersey.

With Fazio, who holds an Italian passport, it seems more that the slower, more tactical Serie A game suits his skill set more so than the fast and furious Premier League.

Clinton Njie

Clinton Njie

It never worked out for Njie at Tottenham. Chances were few and far between after his move from France. The Cameroon international moved to Marseille after a loan spell back in Ligue 1 and found his goalscoring touch in the early stages of season.

He netted five times in his first eight appearances in the league, six of those starts, registering one assist as well. However, since October the goals have dried up somewhat, with just two goals and two assists since.

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The 24-year-old has found successive starts hard to come by, often finding himself on the bench after a start in the previous game. He found the jump from French football to the Premier League just too difficult and the jump back hasn't been a great success thus far.

Pau Lopez featured for Spain U21s last night (Photo by Marco Rosi/Getty Images)

Pau Lopez

He came, he went, he never played. Apart from a couple of matches in the Premier League 2 with the development squad, Lopez never featured for the first team and Spurs didn't take up the option to sign the goalkeeper on a permanent deal.

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The 23-year-old has returned to Espanyol and played 22 times in La Liga and once in the Copa Del Rey. The goalkeeper's contract expires this summer and Tottenham were linked with a return for him, as were Napoli and Juventus, but it appears that Real Betis have won the battle to sign him in on a free.

Filip Lesniak during his Spurs days (Image: Stephen Pond/Getty Images)

Filip Lesniak

The development squad midfielder got to make his Premier League debut in the penultimate match of last season at Leicester City and even bagged an assist.

Lesniak was offered a new deal but chose to go his own way at the end of the season once his contract expired.

The Slovakian turned up at Danish club AaB where he's a first team regular with 22 starts and one substitute appearance in the Superliga.

At 21-years-old it looks like Lesniak has been able to carve out a professional career for himself in the game.